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741 LEGO Trains 12 V Transformer thumbnail image

741 LEGO Trains 12 V Transformer
Images 2
741 LEGO Trains 12 V Transformer
  • 12 V Transformer thumbnail
  • 12 V Transformer thumbnail

Set Value (New/Sealed)

This chart represents the current new/sealed value of the set 12 V Transformer since June 1974. Low accuracy
LEGO 741 12 V Transformer was a Trains set released in 1974. The current value for a new, factory sealed 12 V Transformer is estimated around $97. On the open market, a used set will fetch in the range of between $6 and $12 depending on the condition.
All regions

For Sale (New/Sealed)
(FI) Sticker opened but set never used
$64.37
-33.4%
(US) eBay listings for 12 V Transformer
~$93.78
-3.0%
(DK) Box has a little shelf wear, red tape loose on box, ask for pictures
$143.82
+48.8%

Sets in Trains / 4.5V / 12V

725-2 Freight Train Set

Theme / Subtheme Trains / 4.5V / 12V
Year 1974
Pieces 425
Availability Retired
725-2 LEGO Freight Train Set
Value $1,818.79

182 Train Set with Motor

Theme / Subtheme Trains / 4.5V / 12V
Year 1975
Pieces 369
Availability Retired
182 LEGO Train Set with Motor
Retail $19.99
Value $1,275.58
Growth  6281.1%
Annual growth 8.9%

148 Central Station

Theme / Subtheme Trains / 4.5V / 12V
Year 1975
Pieces / Minifigs 293 / 5
Availability Retired
148 LEGO Trains Central Station
Retail $19.99
Value $755.67
Growth  3680.2%
Annual growth 7.7%

723-2 Diesel Locomotive with DB Sticker

Theme / Subtheme Trains / 4.5V / 12V
Year 1974
Pieces 98
Availability Retired
723-2 LEGO Trains Diesel Locomotive with DB Sticker
Retail $8.50
Value $1,467.83
Growth  17168.6%
Annual growth 10.9%

133 Locomotive

Theme / Subtheme Trains / 4.5V / 12V
Year 1975
Pieces 87
Availability Retired
133 LEGO Trains Locomotive
Retail $2.89
Value $571.91
Growth  19689.3%
Annual growth 11.4%

134 Mobile Crane and Wagon

Theme / Subtheme Trains / 4.5V / 12V
Year 1975
Pieces 86
Availability Retired
134 LEGO Trains Mobile Crane and Wagon
Retail $2.49
Value $550.65
Growth  22014.5%
Annual growth 11.7%

136 Tanker Wagon

Theme / Subtheme Trains / 4.5V / 12V
Year 1975
Pieces 83
Availability Retired
136 LEGO Trains Tanker Wagon
Retail $1.89
Value $173.45
Growth  9077.2%
Annual growth 9.7%

137-2 Passenger Sleeping Car

Theme / Subtheme Trains / 4.5V / 12V
Year 1975
Pieces 82
Availability Retired
137-2 LEGO Trains Passenger Sleeping Car
Retail $1.89
Value $390.13
Growth  20541.8%
Annual growth 11.5%

755 Left and Right Points

Theme / Subtheme Trains / 4.5V / 12V
Year 1974
Pieces 12
Availability Retired
755 LEGO Trains Left and Right Points
Value $27.71

756 Electric Crossing

Theme / Subtheme Trains / 4.5V / 12V
Year 1974
Pieces 5
Availability Retired
756 LEGO Trains Electric Crossing
Value $57.52
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My Collection

12 V Transformer Reviews

22 reviews
4.5
Collectors
Investors
BrickTrains-Sets
“The Lego 741 12v Transformer is the control for the new Lego 12 volt line. Much like the 742: 12v Transformer for 100V Mains, this one is for the normal power outlet. The 742 was made especially for electrical outputs that generate 100 volts of electricity. In the US the... More average voltage in an outlet is 110 – 120 volts.”
Full review at bricktrains-sets.com

About Trains 4.5V / 12V

In 1972 LEGO released the 4.5V and 12V train sets as part of the Blue Era which was named because of the rail color. These train sets used additional conductor rails mounted between the standard 4.5V rails and 12V motors contained in the same housings as the 4.5V motors, but with additional metal contacts attached to the bottom of the housings.

4.5V / 12V consists of 83 sets that ran from 1972 to 1986. As of today, 7750 Steam Engine with Tender is the most valuable 4.5V / 12V set with an estimated new/factory sealed value of $6,646.
Read more